1.Even at low levels,_____ a.the nervous system has produced detrimental effects by lead b.lead's detrimental effects are producing the nervous system c.lead produces detrimental effects on the nervous system d.the detrimental effects produced by lead on the nervous system 2.Working like a telescope,______the size of objects at great distances a.a telephoto lens magnifies b.which magnifies a telephoto lens c.a telephoto lens which magnifies d.and magnifying a telephoto lens 3.In the early twentieth century, the "Model T" automobile was massproduced and sold at a price ______ cold afford a.the average person who b.that the average person who c.the average person d.and the average person 4.Fossil records indicate _____ existing in the past have become extinct a.many species of organisms that b.that many species of organisms c.many species of organisms are d.there are many organisms 5.Before he goes to bed, he makes sure all the taps are ____ off tightly a.closed b.stopped c.shut d.dripped 6.____ what you say, I still think you are blame a.Admit b.Admitting c.Admitted d.Admits 7.____ child has the right to an education regardless of sex, creed,race,or nationality a.some b.little c.any d.few 8.We're hoping to buy a house next year, so we've been _____ a ceitain amount of moey each month towards the deposit a.putting by b.putting together c.putting in d.putting up 9.As a result, war ____ out ten months later a.had broken b,was broken c,broken d.broke 10.The box office is open ___ for ten months later a.daily b.a day c.in day d.daytime 11.Turn the dial in a clockwise direction ___ the indicator comes to rest at No.3 a.while b.until c.since d.whereas